Incremental printing of symbolic information – Ink jet – Controller
Patent
1997-05-15
2000-12-19
Barlow, John
Incremental printing of symbolic information
Ink jet
Controller
B41J 29393
Patent
active
061619132
ABSTRACT:
It has been discovered that inkjet printhead lifetime is related to an amount of accumulated air within the inkjet printhead. The invention, therefore, comprises a method of: determining an amount of ink that is output by an inkjet printhead during a determined period; using the amount of ink so determined to derive an update air accumulation value that is indicative of an amount of air which has accumulated during the determined period within the inkjet printhead; and updating a stored air accumulation parameter in accord with the air accumulation update value. The stored air accumulation parameter is thus related to a projected remaining lifetime of the inkjet printhead. A preferred embodiment stores the air accumulation parameter directly on a memory that is integral with the inkjet printhead. The parameter can further be stored on a memory that is resident on an ink container employed in the inkjet printer.
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Childers Winthrop D.
Sabo Thomas M.
Barlow John
Hewlett--Packard Company
Stewart Jr. Charles W.
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